Students have filed a lawsuit against Sanaa University officials for negligence in the case of a morgue attendant who raped and killed 16 women at the faculty of medicine, the students' union said Tuesday.

The suit was filed by the General Union of Yemeni Students, a body dominated by the ruling General People's Congress of President Ali Abdullah Saleh.

The union, in a press statement, accused Sanaa University's administration and security chief of "negligence and incompetence" over the series of killings which spanned more than four years.

At the same time, the union called for an end to the students' strike held at the university since Saturday, noting the authorities had agreed to their demand to seek out any accomplices of the confessed killer.

Mohammad Adam Omar Ishaak said he strangled to death most of his victims, aged 20-30, chopped up the bodies, dissolved them in acid and threw the remains into the sewers.

On Monday, the Sudanese morgue attendant admitted to killing another 11 young women in Sudan and even more in Kuwait, Chad and the Central African Republic, where he also worked.

The 52-year-old, who was arrested in May only after several months of complaints from parents of missing students, said he had spent time in Lebanon but did not commit any crimes there.

More than 10,000 students marched through the Yemeni capital Sunday demanding that Mohammad Adam be executed and his corpse put on public display. They also called for suspected accomplices to be brought to trial.

The medical faculty's dean, his assistant, and the university's head of security have all been sacked.